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Implement dragging a circle

Hi I have written some code that should allow the user to click on a panel and in doing so draws a circle. The user can then click that circle, selecting it (this can be showed by a change of colour), then drag that circle to a new position. However this is not working in my code. I really need some help.

Here are the classes if you want to run it and see what the problem is. I am really stuck on what is wrong. I hope you can help. Thanks in advance